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Finding the Fourth Proportional to 890.76, 1,229.24 and 517.76

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Solution

The fourth proportional to 890.76, 1,229.24 and 517.76 is: 714.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.76 : 1,229.24 = 517.76 : x
  2. Step 2: Convert to fraction form
    890.76/1,229.24 = 517.76/x
  3. Step 3: Cross multiply
    890.76x = 1,229.24 × 517.76
  4. Step 4: Simplify right side
    890.76x = 636,451.30
  5. Step 5: Solve for x
    x = 636,451.30/890.76
  6. Step 6: Final answer
    x = 714.50

Related Problems

Find fourth proportional to 445.38, 614.62 and 258.88
Half scale
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Double scale
Find fourth proportional to 891.76, 1,230.62 and 518.76
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.